Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016
Cash provided by operations:
Net income	$ 1,933	$ 4,240	$ 3,760
Adjustments to reconcile net income to net cash provided by operations:
Depreciation	747	706	649
Deferred income taxes	647	(273)	(80)
Stock-based compensation	218	215	236
Amortization and other	27	10	13
Net foreign currency adjustments	(99)	(117)	98
Changes in certain working capital components and other assets and liabilities:
Decrease (increase) in accounts receivable	187	(426)	60
(Increase) in inventories	(255)	(231)	(590)
Decrease (increase) in prepaid expenses and other current and non-current assets	35	(120)	(161)
Increase (decrease) in accounts payable, accrued liabilities and other current and non-current liabilities	1,515	(158)	(586)
Cash provided by operations	4,955	3,846	3,399
Cash provided (used) by investing activities:
Purchases of short-term investments	(4,783)	(5,928)	(5,367)
Maturities of short-term investments	3,613	3,623	2,924
Sales of short-term investments	2,496	2,423	2,386
Investments in reverse repurchase agreements	0	0	150
Additions to property, plant and equipment	(1,028)	(1,105)	(1,143)
Disposals of property, plant and equipment	3	13	10
Other investing activities	(25)	(34)	6
Cash provided (used) by investing activities	276	(1,008)	(1,034)
Cash used by financing activities:
Net proceeds from long-term debt issuance	0	1,482	981
Long-term debt payments, including current portion	(6)	(44)	(106)
Increase (decrease) in notes payable	13	327	(67)
Payments on capital lease and other financing obligations	(23)	(17)	(7)
Proceeds from exercise of stock options and other stock issuances	733	489	507
Repurchase of common stock	(4,254)	(3,223)	(3,238)
Dividends — common and preferred	(1,243)	(1,133)	(1,022)
Tax payments for net share settlement of equity awards	(55)	(29)	(22)
Cash used by financing activities	(4,835)	(2,148)	(2,974)
Effect of exchange rate changes on cash and equivalents	45	(20)	(105)
Net increase (decrease) in cash and equivalents	441	670	(714)
Cash and equivalents, beginning of year	3,808	3,138	3,852
CASH AND EQUIVALENTS, END OF YEAR	4,249	3,808	3,138
Cash paid during the year for:
Interest, net of capitalized interest	125	98	70
Income taxes	529	703	748
Non-cash additions to property, plant and equipment	294	266	252
Dividends declared and not paid	$ 320	$ 300	$ 271